A comparative synthetic, magnetic and theoretical study of functional M4Cl4 cubane-type Co(ii) and Ni(ii) complexes
作者:Alessio Ghisolfi、Kirill Yu. Monakhov、Roberto Pattacini、Pierre Braunstein、Xavier López、Coen de Graaf、Manfred Speldrich、Jan van Leusen、Helmut Schilder、Paul Kögerler
DOI:10.1039/c4dt00306c
日期:——
of their transition metal ions in a pseudo-octahedral coordination environment of four Cl atoms and N,O-donor atoms of one chelating HL·S ligand, the substantially different ligand field effects of Co(II) and Ni(II) results in stark differences in their magnetism. In contrast to compound 1 which exhibits a dominant antiferromagnetic intramolecular coupling (J = −0.14 cm−1), 2 is characterised by a ferromagnetic
我们描述的合成,结构和新的M的磁化学4氯4立方烷型钴(II)和镍(II)配合物与式[M(μ 3 -Cl)氯(HL·S)] 4(1: M = Co;2:M = Ni),其中HL·S表示具有硫醚官能团的吡啶基-醇型配体,被引入以允许随后结合至Au表面。使用计算框架CONDON 2.0中实现的全自旋哈密顿量对1和2的DC和交流磁化率数据进行建模。虽然两个协调小组都1和(2)是同构的,它们的每个过渡金属离子在一个螯合HL·S配体的四个Cl原子和N,O供体原子的伪八面体配位环境中,Co(II)和Ni(II)导致它们的磁性存在明显差异。与表现出主要反铁磁分子内偶联(J = -0.14 cm -1)的化合物1相反,化合物2的特征在于铁磁偶联(J = +10.6 cm -1),并且被认为是单分子磁体(SMM),这是将来进行表面沉积研究时特别感兴趣的功能。进行了基于密度泛函理论(DFT)的分析,以探索这些化